The four huge space rocks are expected to make a "close approach" to our planet on Wednesday as they miss Earth by around 1.5million miles.

Scientists say they're not worried about the asteroids hurtling towards humanity at a mind-boggling eight miles per second.

The biggest of the four is 853ft across — twice the height of the London Eye.

Top Facts About Asteroids

Asteroids are small, rocky objects that orbit the Sun. The first asteroid was Ceres, discovered by Giuseppe Piazzi in 1801. There are currently over 600,000 known asteroids in our solar system. Most asteroids are found orbiting in the Asteroid Belt, a series of rings located between the orbits of Mars and Jupiter.

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There are Millions of Asteroids in the solar system, usually found in the Asteroid belt between Mars and Jupiter, however those in that pass the Earth are called Near-Earth objects

“I don't remember that this has ever happened before”

Dr Detlef Koschny

And the closest will be close to the size of a blue whale at 46 metres wide.

Planetary scientist Dr Detlef Koschny said the biggest asteroid would cause "quite some damage" if it smashed into Earth.

She said it is "very rare" to see four Near-Earth Asteroids (NEA) occur on the same day.

"I don't remember that this has ever happened before," she told MailOnline.